VO2 Max Estimator
Estimate your VO2 max — a key measure of aerobic fitness — from your running distance, time, and body weight. Useful for athletes and fitness enthusiasts tracking cardiovascular capacity.
About this calculator
VO2 max is the maximum rate at which your body can consume oxygen during intense exercise, expressed in millilitres of oxygen per kilogram of body weight per minute (mL/kg/min). It is widely regarded as the gold standard measure of cardiovascular fitness. This calculator uses a field-test estimation formula: VO2 max = 15.3 × (distance in metres / time in seconds) × (70 / weight in kg). The constant 15.3 is an empirically derived scaling factor. The ratio (distance / time) gives your average speed in m/s. Dividing by body weight normalises the result so heavier individuals aren't unfairly penalised. A VO2 max above 50 mL/kg/min is considered excellent for men; above 43 mL/kg/min for women. Elite endurance athletes often exceed 70–80 mL/kg/min. Regular aerobic training — running, cycling, swimming — can meaningfully improve VO2 max over time.
How to use
Example: A 70 kg runner completes a 1,500-metre time trial in 375 seconds (6 minutes 15 seconds). Step 1 — Calculate speed ratio: 1500 / 375 = 4.0 m/s. Step 2 — Apply weight normalisation: 70 / 70 = 1.0. Step 3 — Apply full formula: VO2 max = 15.3 × 4.0 × 1.0 = 61.2 mL/kg/min. A score of 61.2 mL/kg/min falls in the 'superior' category for most adult men. Now try a heavier runner: 90 kg, same distance and time. VO2 max = 15.3 × 4.0 × (70 / 90) = 15.3 × 4.0 × 0.778 = 47.6 mL/kg/min — showing how weight affects the score.
Frequently asked questions
What is a good VO2 max score for my age and gender?
VO2 max naturally declines with age and differs between men and women due to physiological differences in heart size and haemoglobin levels. For men aged 30–39, a score above 49 mL/kg/min is considered excellent; for women in the same age group, above 43 mL/kg/min is excellent. Average scores for untrained adults typically range from 30–45 mL/kg/min. Elite marathon runners often post values of 65–80 mL/kg/min. Many fitness trackers (Garmin, Apple Watch) also estimate VO2 max using heart rate data, though running-based field tests tend to be more accurate.
How can I improve my VO2 max through training?
The most effective methods for improving VO2 max are high-intensity interval training (HIIT) and tempo runs. HIIT sessions — such as 4 × 4-minute intervals at 90–95% of maximum heart rate — have been shown to increase VO2 max by 5–15% over 6–12 weeks. Long, steady-state aerobic runs also contribute, especially for beginners. Consistency is key: training at least 3–4 times per week is necessary to see meaningful gains. Allowing adequate recovery between hard sessions prevents overtraining, which can plateau or reverse progress.
How accurate is a field test for estimating VO2 max compared to a lab test?
Laboratory VO2 max tests, performed on a treadmill or cycle ergometer with a metabolic analyser, are the gold standard and accurate to within 1–2%. Field-test formulas like the one used here are estimates derived from statistical modelling and are accurate to within roughly 5–10% for most people. Factors such as pacing strategy, terrain, weather, and fatigue on test day can all affect field-test results. For training purposes, field estimates are perfectly adequate to track trends over time, even if the absolute number differs slightly from a lab result. Retest under the same conditions to make meaningful comparisons.